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Flashcards in Epithelial Tissues Deck (44)
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1

What are the three embryonic layers?

The ectoderm; the mesoderm; and the endoderm

2

What is the Ectoderm?

The outermost of three primary germ cell layers in the very early embryo

3

What is the Endoderm?

The innermost of three germ cell layers in the very early embryo

4

What is the Mesoderm?

The middle of the three primary germ cell layers of the early embryo

5

What are some examples of the tissues that grow out of the Endoderm?

Most of the alimentary canal; the respiratory tract; endocrine glands; urinary bladder and part of the urethra

6

What is a tissue?

a group of cells with common functions

7

What is an organ?

two or more tissues that work together to perform a particular function

8

What are the four categories of tissues?

Epithelial: connective: muscular: nervous

9

What are 6 characteristics of epithelial tissues?

cells are close together;form continous sheets;regenerative;avascular;free or apical surface; rest on a basement membrane

10

What are three traits of simple squamous cells?

flat; one layer; found where diffusion and filtration occur

11

What are three examples of tissues comprised of simple squamous cells

alveoli; capillaries; kidneys

12

What are 3 traits of simple cuboidal cells?

cube like; one layer; spherical nucleus; function in secretion and absorbtion

13

What are 4 traits of simple columnar cells?

column shapped; nucleous near base; may be ciliated; function in secretion and absorbtion

14

What are 4 traits of stratified squamous cells?

top layer flat or squamous; basal layers cuboidal or columnar and growing activly; found in areas that need proection

15

What are some examples of tissues comprised of stratified squamous cells?

skin; vagina; mouth; pharynx; esophagus; anal canal

16

What are 3 traits of stratified cuboidal cells?

Rare; usually only two layers; mostly in the ducts of larger glands

17

Where can stratified cuboidal cells be found in the body?

sweat glands, mammary glands

18

What are 3 traits of Stratified Columnar cells?

rare; usually only two layers; mostly in the ducts of larger glands; only apical layer is columnar

19

Where can stratified columnar cells be found in the body?

portions of the pharynx; the male urethra; the junction between the two other types of epithelia; and the lining of some glandular ducts

20

What are Pseudostratified Columnar cells?

a single layer of cells of differing heights; some cells not reaching the surface; nuclei seen at different levels; may be ciliated and have mucous secreting cells

21

What are the functions of Pseudostratified columnar cells?

secretes substances; particularly mucus; propulsion of mucus by ciliary action

22

What are some of the locations of ciliated Pseudostratified Columnar cells?

the trachea; upper respiratory tract

23

What are some of the locations of non-ciliated Pseudostratified Columnar cells?

sperm carrying ducts and the ducts of other large glands

24

What are some characteristics of transitional epithelium?

basal cells cuboidal or columnar; surface cells dome shaped or squamouslike depending on degree of organ stretch; resembles both stratified squamous and cuboidal

25

Where can transitional epithelium be found in the body?

the lining of the ureters; bladder; and part of the urethra

26

What is the function of transitional epithelium?

to stretch readily; especially useful for the bladder which must stretch to accommodate urine

27

What is a gland?

one or more cells that secrete a particular product

28

What is a secretion?

an aqueous fluid that usually contains proteins but can also contain lipids or steroids

29

What is an endocrine gland?

a gland that produces hormones and secretes directly into the extracellular space

30

What are ductless glands?

endocrine glands